Twitter's debut as a publicly traded company was impressive but its first day pop of nearly 73 percent has been exceeded by four other Silicon Valley IPOs this year alone.

And it's nowhere near the first day jump enjoyed by LinkedIn back in May 2011, when its shares jumped by about 109 percent. That is the biggest IPO pop of any Silicon Valley company since the mythical stock trading days of the dotcom era.

Two of the biggest Silicon Valley IPO pops of the year came on the same day in September.

The biggest jump so far this year was posted by Rocket Fuel, the Redwood City ad tech company whose shares jumped more than 93 percent when it went public on Sept. 20. Milpitas-based data security company FireEye posted an 80 percent stoick jump that same day, the third biggest among local companies this year.

The second biggest debut pop was by Pleasanton-based life-science software company Veeva Systems, which jumped by 85 percent when it went public last month.

The fourth biggest this year was San Mateo marketing automation software business Marketo when it went public in May. Its stock was up nearly 78 percent on its first day as a public company.

So that makes Twitter's IPO day pop the fifth best of the year in Silicon Valley.

There are some who argue big first day jumps aren't anything to celebrate. They argue that it means the company raised far less money than they might have.

Of course, it's highly unlikely that ever would have happened if Twitter had raised the $1 billion it "left on the table" by selling its IPO shares at $26.

As Box CEO Aaron Levie, who will probably be faced with IPO math himself in the not-terribly-distant future, tweeted on Thursday: "IPOs: If your stock shoots up, you left money on the table. If it drops, you screwed investors. If it's flat, you're boring."